Evaluation of material parameters, texture and stress of a prestressed polycrystalline aggregate from ultrasonic measurements

摘要

The propagation of ultrasonic plane waves in a polycrystalline aggregate (steel) is con- sidered for a bulk sample of the material with plane initial (residual) stress, the material being made of cubic crystals of the highest symmetry. Some effective stiffness moduli of the bulk sample and the components of the initial stress are found as functions of the prop- agation velocities of the respective ultrasonic plane waves. Moreover, the use is made of Jaynes' principle of maximum Shannon entropy and the averaging procedure proposed by Voigt.